摘要
水力压裂对于煤与瓦斯突出防治和工作面安全生产具有重要意义,基于断裂力学法,对水力裂压后煤层变化特征进行数值模拟分析,并对应用效果进行研究,结果表明,煤层的破坏形式为拉张和剪切破坏,随着注水压力的不断增大,裂缝逐渐扩展变大,宽度逐渐增加。随着注水压力的增加,压裂半径逐渐变大,相同压裂半径下,注水压力越小,裂隙扩展角度越大。水力压裂后,抽出瓦斯浓度随着时间的推移逐渐上升,水力压裂之后的瓦斯抽采浓度是水力压裂之前的6倍。
The results show that the failure modes of coal seam are tensile and shear failure.With the increasing of water injection pressure,the crack expands gradually and the width increases gradually.After hydraulic fracturing,the gas concentration gradually rises with time,and the gas concentration after hydraulic fracturing is six times that before hydraulic fracturing.
出处
《内蒙古煤炭经济》
2018年第22期3-4,108,共3页
Inner Mongolia Coal Economy
关键词
煤矿安全
水力压裂
瓦斯抽采
数值模似
Coal mine safety
Hydraulic fracturing
Gas extraction
Numerical simulation
